Safety-brake.



L. M. DODDRIDGE.

SAFETY BRAKE.

APPLIGATIQN FILED MAY 7,1913.

1,124,216. Patented Jan. 5, 1915.

wi tywowo 1M5 NORRIS PETERS 60.. PNOrO-LITHQ. wAshuva ON. 0 c.

UNITED STATES PATENT oEEioE.

LOYAL M. DODDRIDGE, OF STANTON, MICHIGAN, ASSIGNOR OF ONE-HALF TO GEORGE E. DAKIN, OF STANTON, MICHIGAN.

SAFETY-BRAKE.

Specification of Letters Patent.

Patented Jan. 5, 1915.

To all whom it may concern:

Be it known that I, LOYAL M. DODDRIDGE, a citizen of the United States, residing at Stanton, in the county of Montcalm and State of Michigan, have invented certain new and useful Improvements in Safety- Brakes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in railway brakes, and particularly to auxiliary brakes.

The particular object of the invention is to provide a simple device which can be quickly and easily operated and which is effective to lock the wheels of the train from rotation, and also to prevent them sliding on the track and the consequent fiattening of the wheels.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawings.

In the drawings: Figure l is a side elevation showing my brake shoes in elevated position. Fig. 2 is a similar view showing them in applied position. Fig. 3 is a plan view of the brake devices and means for raising the brake shoe. Fig. 4 is an end elevation.

Referring particularly to the accompanying drawings, 10 represents the truck of the tender of a train, this truck having a rearward extension 11 which carries a block 12 provided with the curved way 13. Mounted to slide in this way is a similarly formed chock block 14, the lower end of which is oppositely beveled and provided with a side flange 15 to prevent the same from leaving the track when engaged by the wheel 16. This chock block has a series of rack teeth 17 which are engaged by a pinion 18' carried by the transverse shaft 19 journaled in the block 12. This shaft extends transversely of the car and has its central portion provided with a crank 20. There is one of these chock blocks mounted in front of the front wheel and in rear of the rear wheel of each of the trucks of the train, and extending transversely and journaled in their ends in the blocks 12 are the shafts l9. Extending longitudinally of the train and connected to the cranks 20 is a chain 21, the forward end of which is secured to and wound upon a shaft 22 of a rotary steam motor 23 carried by the tender. The steam inlet and exhaust pipes of the motor are indicated at 23 and 23.

The motor 23 is rotated in one direction to wind the chain, rock the shafts 19 and draw the chock blocks 14 into elevated position. Suitable pawl and ratchet mechanism 24 is disposed in connection with the motor 23 to hold the same against retrograde movement after the blocks 14 have been raised. By releasing this pawl, the weights of the blocks 14 will cause them to slide into position when the brakes are to be applied. As the double beveled end of each of the blocks 14 engages the track, frictional contact therewith will draw the same under the tread of the wheel, and cause the wheel to ride thereupon away from the rail. The wheels of the train will thus be relieved of the sliding contact with the rails which usually occurs in the ordinary brake system. The flanges 15 of the block 14 prevent the train from being derailed.

What is claimed is:

In an auxiliary brake system for railways, blocks mounted in line with the wheels of the cars, chock blocks slidably mounted in the first named blocks, said chock blocks carrying rack teeth, transverse crank shafts journaled in the first named blocks,'pinions on the shafts engaging the teeth of the chock blocks, a chain extending longitudinally of the train and connected to the crank shafts, and a rotary motor for winding the chain.

In testimony whereof, I aflix my signature, in the presence of two witnesses.

LOYAL M. DODDRIDGE.

Witnesses:

CHAS. W. FRENCH, GEORGE E. DAKIN.

(Ioplee of this patent may be obtained for five cents each, by addressing the commissioner of Patents,

Washington, I). G. 

